This dialog box is used to set the comment delimiters used when reformatting text. Typically this happens when you use <Ctrl-F>or the Comment or Comment box commands on the EditText formatting submenu.
"After using Brief for many years, I did not look forward to learning
vi or Emacs on my UNIX machine. CRiSP came to the rescue. The program
has now grown and matured to the point where it has become much better
than Brief ever was."